Man of Honour
A cycle is going from 100% to 0% which most realistically don't do in a day.
https://www.apple.com/uk/batteries/service-and-recycling/
Hmmm..... Apple stating its 1 year for the battery. Guess its only £25 at the min. They should just change the battery and seal it back up.
Does 100->50 then 100->50 count as 1 cycle too?